这真的很奇怪，它发生在更新一个 Twig 模板之后:

Controller 部分

    $registration = new Registration();
    $form = $this->createForm(new RegistrationType(), $registration, array(
        'action' => $this->generateUrl('account_create'),
    ));

    return $this->render(
        'AcmeCommonBundle:Security:register.html.twig',
        array(
            'form' => $form->createView(),
            'contentBackColor' => 'canvasGreen'
            )
    );

模板部分

{{ form_start(form) }}
    {{ form_errors(form) }}

    <p>All Fields Are Required</p>

    <div class="form-row">
        {{ form_label(form.firstname, "First Name") }}
        {{ form_widget(form.firstname) }}
        <div class="clear-fix"></div>
    </div>
    <div class="form-errors-row">
        {{ form_errors(form.firstname) }}
    </div>

    <div class="form-row">
        {{ form_label(form.lastname, "Last Name") }}
        {{ form_widget(form.lastname) }}
        <div class="clear-fix"></div>
    </div>
    <div class="form-errors-row">
        {{ form_errors(form.lastname) }}
    </div>

    <div class="form-row">
        {{ form_label(form.username, "Username") }}
        {{ form_widget(form.username) }}
        <div class="clear-fix"></div>
    </div>
    <div class="form-errors-row">
        {{ form_errors(form.username) }}
    </div>

    <div class="form-row">
        {{ form_label(form.email, "Email") }}
        {{ form_widget(form.email) }}
        <div class="clear-fix"></div>
    </div>
    <div class="form-errors-row">
        {{ form_errors(form.email) }}
    </div>

    <div class="form-row">
        {{ form_label(form.password, "Password") }}
        {{ form_widget(form.password) }}
        <div class="clear-fix"></div>
    </div>
    <div class="form-errors-row">
        {{ form_errors(form.password) }}
    </div>

    <div class="form-row">
        {{ form_label(form.confirm, "Confirm Password") }}
        {{ form_widget(form.confirm) }}
        <div class="clear-fix"></div>
    </div>
    <div class="form-errors-row">
        {{ form_errors(form.confirm) }}
    </div>

    <div class="form-row">
        {{ form_label(form.terms, "Terms & Conditions") }}
        {{ form_widget(form.terms) }}
        <div class="clear-fix"></div>
    </div>
    <div class="form-errors-row">
        {{ form_errors(form.terms) }}
    </div>

{{ form_end(form) }}

错误

Argument 1 passed to Symfony\Component\Form\FormRenderer::searchAndRenderBlock() must be an instance of Symfony\Component\Form\FormView, null given

如您所见，我确实在渲染 FormView，它为 null 的事实会让我相信这与 RegistrationType() 类有关，但那里没有任何变化，只是在要渲染的模板中？

最佳答案

好吧，这真的很具体而且我想通了，所以我想我会在这里为任何在 Google 上找到它的人更新。

问题是我原来的表单实现在 twig 中看起来像这样:

{{ form(form) }}

它所做的是遍历整个 form 变量并显示所有要显示的内容。

问题是我的 View 变量是错误的。这是因为 RegistrationType() 对象添加了另一个 UserType() 对象作为 user 字段，如下所示:

->add('user', new UserType())

这意味着调用:

{{ form_label(form.firstname, "First Name") }}

应该是:

{{ form_label(form.user.firstname, "First Name") }}

我没有发现这个错误的主要原因是因为 Twig 给出的错误没有告诉我它在哪个表单调用上失败了，我自动假设它是第一个，{{ form_start(form) }}。然而，那个电话很好。

我查看了显示的 HTML 并注意到它走了多远，这让我调查了出现问题的特定行。

Twig 模板现在看起来像这样并且正确呈现:

{{ form_start(form) }}
    {{ form_errors(form) }}

    <p>All Fields Are Required</p>

    <div class="form-row">
        {{ form_label(form.user.firstname, "First Name") }}
        {{ form_widget(form.user.firstname) }}
        <div class="clear-fix"></div>
    </div>
    <div class="form-errors-row">
        {{ form_errors(form.user.firstname) }}
    </div>

    <div class="form-row">
        {{ form_label(form.user.lastname, "Last Name") }}
        {{ form_widget(form.user.lastname) }}
        <div class="clear-fix"></div>
    </div>
    <div class="form-errors-row">
        {{ form_errors(form.user.lastname) }}
    </div>

    <div class="form-row">
        {{ form_label(form.user.username, "Username") }}
        {{ form_widget(form.user.username) }}
        <div class="clear-fix"></div>
    </div>
    <div class="form-errors-row">
        {{ form_errors(form.user.username) }}
    </div>

    <div class="form-row">
        {{ form_label(form.user.email, "Email") }}
        {{ form_widget(form.user.email) }}
        <div class="clear-fix"></div>
    </div>
    <div class="form-errors-row">
        {{ form_errors(form.user.email) }}
    </div>

    <div class="form-row">
        {{ form_label(form.user.password.password, "Password") }}
        {{ form_widget(form.user.password.password) }}
        <div class="clear-fix"></div>
    </div>
    <div class="form-errors-row">
        {{ form_errors(form.user.password.password) }}
    </div>

    <div class="form-row">
        {{ form_label(form.user.password.confirm, "Confirm Password") }}
        {{ form_widget(form.user.password.confirm) }}
        <div class="clear-fix"></div>
    </div>
    <div class="form-errors-row">
        {{ form_errors(form.user.password.confirm) }}
    </div>

    <div class="form-row">
        {{ form_label(form.terms, "Terms & Conditions") }}
        {{ form_widget(form.terms) }}
        <div class="clear-fix"></div>
    </div>
    <div class="form-errors-row">
        {{ form_errors(form.terms) }}
    </div>

{{ form_end(form) }}

关于php - Symfony2 表单给出关于 FormView 的可捕获错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/19103558/